Star poly(lactic acid)was successfully synthesized via bulk ring opening polymerization of lactide using meso-tetra(p-aminophenyl)porphyrin (TAPP)as initiator and stannous octanoate (Sn(Oct)2)as catalyst under vacuum.Molecular structure of the four armed poly(lactic acid)was characterized via 1H-NMR and FTIR.It was confirmed that the star poly(lactic acid)was comprised with four-armed polymer chain and a tin porphyrin core.The molecular weight was also studied via GPC and 1H-NMR

and molecular weight distribution was also characterized (Mw/Mn=1.97).Both star poly(lactic acid) film and linear poly(lactic acid) film were prepared using solution-casting method.Structural analysis via X-ray diffraction indicates that the star poly(lactic acid)films display the orthorhombic -crystalline form

while linear poly(lactic acid)films display amorphous structure.The photoelectron study of the functional poly(lactic acid) via UV-Vis absorption spectra reveals that the star poly(lactic acid)displays photoelectric property of tin porphyrin.